worktree: test basic merge functionality

tests/worktree/merge.c

+#include "clar_libgit2.h"
+
+#include "worktree_helpers.h"
+#include "merge/merge_helpers.h"
+
+#define COMMON_REPO "testrepo"
+#define WORKTREE_REPO "testrepo-worktree"
+
+#define MASTER_BRANCH "refs/heads/master"
+#define CONFLICT_BRANCH "refs/heads/merge-conflict"
+
+#define CONFLICT_BRANCH_FILE_TXT \
+	"<<<<<<< HEAD\n" \
+	"hi\n" \
+	"bye!\n" \
+	"=======\n" \
+	"conflict\n" \
+	">>>>>>> merge-conflict\n" \
+
+static worktree_fixture fixture =
+	WORKTREE_FIXTURE_INIT(COMMON_REPO, WORKTREE_REPO);
+
+static const char *merge_files[] = {
+	GIT_MERGE_HEAD_FILE,
+	GIT_ORIG_HEAD_FILE,
+	GIT_MERGE_MODE_FILE,
+	GIT_MERGE_MSG_FILE,
+};
+
+void test_worktree_merge__initialize(void)
+{
+	setup_fixture_worktree(&fixture);
+}
+
+void test_worktree_merge__cleanup(void)
+{
+	cleanup_fixture_worktree(&fixture);
+}
+
+void test_worktree_merge__merge_head(void)
+{
+	git_reference *theirs_ref, *ref;
+	git_annotated_commit *theirs;
+
+	cl_git_pass(git_reference_lookup(&theirs_ref, fixture.worktree, CONFLICT_BRANCH));
+	cl_git_pass(git_annotated_commit_from_ref(&theirs, fixture.worktree, theirs_ref));
+	cl_git_pass(git_merge(fixture.worktree, (const git_annotated_commit **)&theirs, 1, NULL, NULL));
+
+	cl_git_pass(git_reference_lookup(&ref, fixture.worktree, GIT_MERGE_HEAD_FILE));
+
+	git_reference_free(ref);
+	git_reference_free(theirs_ref);
+	git_annotated_commit_free(theirs);
+}
+
+void test_worktree_merge__merge_setup(void)
+{
+	git_reference *ours_ref, *theirs_ref;
+	git_annotated_commit *ours, *theirs;
+	git_buf path = GIT_BUF_INIT;
+	unsigned i;
+
+	cl_git_pass(git_reference_lookup(&ours_ref, fixture.worktree, MASTER_BRANCH));
+	cl_git_pass(git_annotated_commit_from_ref(&ours, fixture.worktree, ours_ref));
+
+	cl_git_pass(git_reference_lookup(&theirs_ref, fixture.worktree, CONFLICT_BRANCH));
+	cl_git_pass(git_annotated_commit_from_ref(&theirs, fixture.worktree, theirs_ref));
+
+	cl_git_pass(git_merge__setup(fixture.worktree,
+		    ours, (const git_annotated_commit **)&theirs, 1));
+
+	for (i = 0; i < ARRAY_SIZE(merge_files); i++) {
+		git_buf_clear(&path);
+		cl_git_pass(git_buf_printf(&path, "%s/%s",
+			    fixture.worktree->path_repository, merge_files[i]));
+		cl_assert(git_path_exists(path.ptr));
+	}
+
+	git_buf_free(&path);
+	git_reference_free(ours_ref);
+	git_reference_free(theirs_ref);
+	git_annotated_commit_free(ours);
+	git_annotated_commit_free(theirs);
+}
+
+void test_worktree_merge__merge_conflict(void)
+{
+	git_buf path = GIT_BUF_INIT, buf = GIT_BUF_INIT;
+	git_reference *theirs_ref;
+	git_annotated_commit *theirs;
+	git_index *index;
+	const git_index_entry *entry;
+	size_t i, conflicts = 0;
+
+	cl_git_pass(git_reference_lookup(&theirs_ref, fixture.worktree, CONFLICT_BRANCH));
+	cl_git_pass(git_annotated_commit_from_ref(&theirs, fixture.worktree, theirs_ref));
+
+	cl_git_pass(git_merge(fixture.worktree,
+		    (const git_annotated_commit **)&theirs, 1, NULL, NULL));
+
+	cl_git_pass(git_repository_index(&index, fixture.worktree));
+	for (i = 0; i < git_index_entrycount(index); i++) {
+		cl_assert(entry = git_index_get_byindex(index, i));
+
+		if (git_index_entry_is_conflict(entry))
+			conflicts++;
+	}
+	cl_assert_equal_sz(conflicts, 3);
+
+	git_reference_free(theirs_ref);
+	git_annotated_commit_free(theirs);
+	git_index_free(index);
+
+	cl_git_pass(git_buf_joinpath(&path, fixture.worktree->workdir, "branch_file.txt"));
+	cl_git_pass(git_futils_readbuffer(&buf, path.ptr));
+	cl_assert_equal_s(buf.ptr, CONFLICT_BRANCH_FILE_TXT);
+
+	git_buf_free(&path);
+	git_buf_free(&buf);
+}
+